EP0120320A2 - Rahmenwerk für Seriendrucker - Google Patents

Rahmenwerk für Seriendrucker Download PDF

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Publication number
EP0120320A2
EP0120320A2 EP84101993A EP84101993A EP0120320A2 EP 0120320 A2 EP0120320 A2 EP 0120320A2 EP 84101993 A EP84101993 A EP 84101993A EP 84101993 A EP84101993 A EP 84101993A EP 0120320 A2 EP0120320 A2 EP 0120320A2
Authority
EP
European Patent Office
Prior art keywords
side plates
rider
screw
side plate
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84101993A
Other languages
English (en)
French (fr)
Other versions
EP0120320A3 (en
EP0120320B1 (de
Inventor
Cosimo Cassiano
Paolo Urso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bull HN Information Systems Italia SpA
Original Assignee
Honeywell Bull Italia SpA
Honeywell Information Systems Italia SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell Bull Italia SpA, Honeywell Information Systems Italia SpA filed Critical Honeywell Bull Italia SpA
Publication of EP0120320A2 publication Critical patent/EP0120320A2/de
Publication of EP0120320A3 publication Critical patent/EP0120320A3/en
Application granted granted Critical
Publication of EP0120320B1 publication Critical patent/EP0120320B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/02—Framework

Definitions

  • the present invention relates to a serial printer frame and, more pre cisely, to the means securing the platen and the printing carriage guiding bars to such frame.
  • the frame of a serial printer is generally constituted by a basement and by two side plates provided with suitable housings where the ends of the platen and of the carriage guiding bars are inserted and steadi ly restrained.
  • the printing carriage where a printing head is mounted, slides along the guiding bars to subsequently take different printing positions along a printing line.
  • the carriage is moved by a motor, preferably a step motor, through a flexible transmission, generally and preferably a toothed belt.
  • the paper feeding for the printing of several lines is performed by suitable feeding elements, such as tractors or pin wheels, or by a cy lindric shaped platen rotatable around its axis and which cooperates with suitable pressure rollers pressing the paper against the platen.
  • suitable feeding elements such as tractors or pin wheels, or by a cy lindric shaped platen rotatable around its axis and which cooperates with suitable pressure rollers pressing the paper against the platen.
  • a perfect parallelism between the printing platen and the printing car riage guiding bars is required in the serial printers and, particularly, in those printers which must perform high quality printing. In this way a constant distance between printing head and printing pla ten is assured along the whole printing line, so that a constant impact energy is obtained and the printed alphanumerical characters are perfectly matched as to an imaginary median line of the printing line.
  • the lack of parallelism is generally due both to the defective position ing of the housings intended to receive the ends of the platen and of the guiding bars on the frame side plates, and to the possible slacks between the side plate housings and the ends of the platen or the guiding bars.
  • These adjusting means consist of fixing and gauging screws which act in radial directions contained in the side plate plane or in a plane pa- rallely thereto.
  • the housings in each side plate are obtained by a simple blanking operation and consist of V shaped housings providing a well definite refe rence and support dihedral.
  • the possible position inaccuracy in the blanking of the side plates does not affect at all the relative position of the housings therein. Also the possible wear of the blanking fixture (die and punch) equally affects the relative distances of the housings on both side plates.
  • the platen and guiding bar ends are firmly pressed in the related dihe drals by retaining riders which eliminate the slacks among the elements by performing a suitable pressure on said ends towards the dihedral apex.
  • the clamping riders are fixed to the panels by tapered head screws which get through the riders and are screwed to the side plates perpendicularly to the plate plane.
  • the riders pressure on the platen and guiding bars ends is obtained by interaction of the tapered screw heads with corresponding tapered housings.
  • the distance between the contact point of the riders positioned for the assembling, with the platen or the bar ends and the axis of the screw housings in the side plates is greater than the distance between the contact point of the riders with the platen or the bar ends and the axis of the tapered housings in the riders.
  • the riders are preferably embodied with plastic material in order to assure a suitable elastic extension.
  • Figure 1 shows the elements of a serial printer frame essential for understanding the present invention.
  • the frame of Fig. 1 comprises 2 side plates lA, 1B firmly restrained to a basement 1C.
  • Both basement 1C and side plates lA, 1B are in metal sheet of suitable thickness in order to provide a high strength to the equipment.
  • the two side plates 1A, 1B are plane and identical each other.
  • Side plates lA, 1B of Fig. 1 support guiding bars 4, 5 and a shaft 2 on which a cylindrical platen 3 is mounted.
  • a printing carriage not shown, axially slides along the guiding bars. It is mounted on guiding bar 4 by means of axial bushings or bearings. Guiding bar 5 generally acts as guiding rail to avoid the carriage rota tion around bar 4.
  • the platen may be a fixed or a rotating platen.
  • Fig. 1 shows the rotating platen case.
  • shaft 2 The ends of shaft 2 are engaged in two bearings 6A, 6B which are housed in two housings 7A, 7B of side plates 1A, 1B respectively.
  • Such ends may protrude externally from side plates 1A, 1B for coupling with motor means, not shown.
  • the ends of guiding bar 4 are directly housed into two housings 8A, 8B of side plates 1A, 1B respectively.
  • Such ends protrude externally from side plates 1A, 1B.
  • the ends of guiding bars 5 are engaged in two holes 10A, 10B of side plates 1A, 1B through two housings 9A, 9B.
  • Fig. 2 partially shows the contour of one of the side plates.
  • V shaped housing 7 constitutes a supporting dihedral where bearing 6 lays in a stable position by contacting the housing in two generating lines 30, 31.
  • housing 8 V shaped too, constitutes a supporting dihedral stable where the end of bar 4 lays in avposition by contacting the housing in two generating lines 33, 34.
  • the distance between bearing 6 axis and bar 4 axis is equal on both the side plates and such distance is not affected by positioning slacks.
  • bearings 6A, 6B are steady pressed in housings 7A, 7B by two riders 11A, 11B respectively.
  • Such riders are constituted by a semitoroidal body 12A, 12B inside which bearings 6A, 6B are respec tively housed.
  • the body externally protrudes with two fixing ears each one provided with a hole 15A, 15B and 16A, 16B respectively.
  • the riders are fixed to side plates 1A, 1B respectively by means of tapered head screws 13A, 14A, 13B, 14B respectively.
  • Such screws gets through holes 15A, 15B and 16A, 16B and are screwed into corresponding threaded housings formed on the side plates and respectively indicated by reference numbers 19A, 20A, 19B, 20B.
  • the ends of guiding bar 4 are steady pressed in housings 8A 8B by two riders 21A, 21B respectively.
  • Riders 21A, 21B are fixed to the side plates, each one by a tapered head screw 24A, 24B respectively, which is engaged in a second hole 23A, 23B respectively of the riders and is screwed in a corresponding threaded housing, 25A, 25B respectively, formed in the side plates.
  • Screws 13, 14, 24 act with a screwing axis perpen dicular to the side plates plane (and therefore parallel to the axis of the platen and of the guiding bars) and, once clamped they steady press riders 11A, 11B, 21A, 21B against the side plates.
  • threaded housing 25 is arranged in order that its axis has a distance H1 from generating line 38 of bar 4 more far away when this last is engaged into dihedral 8.
  • Fig. 3 and 4 respectively show in front view and in section view accor ding to plane A-A, rider 21.
  • the rider has an upper tapered opening 22 and a lower opening 23.
  • Upper opening 22 is intended to receive the guiding bar end and has a diameter slightly larger than the bar to ease its insertion.
  • Lower opening 23 is intended to receive a fixing screw and comprises a cylindrical portion 35 and a tapered housing 36.
  • the axis of tapered housing 36, parallel to the axis of opening 22, is at a distance H from generating line 37 more far away of opening 22.
  • H is suitably smaller than H1.
  • Dl of seat 35 must be equal to D + (H1 - H) ⁇ 2.
  • Such alignment may be established even if H is lesser than H1 owing to the opening diameter Dl which is wider than the screw and the threaded housing 25 diameter.
  • Screw 24 is inserted into opening 23 and it is screwed into housing 25.
  • Screw 24 when screwed into housing 25, has an eccentric position as to the opening 23 that is its axis is in opposition to generating line 37 as regards the axis of tapered housing 36.
  • the tapered head begins to interfere with the lower surface of tapered housing 36 and pull downwords rider 21 in order to make tapered housing 36 coaxial to the screw.
  • riders 11A, 11B The function carried out by riders 11A, 11B is the same even if, in this case, the clamping occurs by means of two screws, instead of one and the rider body acts on bearings 6A, 6B by elongating out of the external surface of the side plates towards the inside.
  • side plates 1A and 1B may consists in plane metallic elements obtained by blanking and bending operations are not required for obtaining support or fixing wings for rider of conventional type, where clamping screws acts in the same direction of the force they have to perform.
  • the described printed frame is only a preferred embodiment of the invention and that several variants can be brought. Riders such as the disclosed ones can for instance be used only for positioning the platen bearings; while the guiding bar ends may be po sitioned into the corrisponding housings by different devices. Likewise, considering the rider structure, the cylindric shaped housings 35 can have a form different from the one described which has circular section of diameter Dl suitably wider than the one of the screws they have to receive.
  • they may consist of a groove with semicircular ends, having a widness equal to the diameter of the screw to be housed.
  • Such grooves may be eccentrically elongated as to the tapered portion in order to allow at first the easy insertion, without interference, of the screw in eccentric position as to the tapered housing, and then the relative shift of the screw within the groove, without interference, up to the coaxial alignment of the screw and of the tapered housing.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Common Mechanisms (AREA)
EP84101993A 1983-03-21 1984-02-25 Rahmenwerk für Seriendrucker Expired EP0120320B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2017283 1983-03-21
IT20172/83A IT1160812B (it) 1983-03-21 1983-03-21 Struttura meccanica di una stampante seriale

Publications (3)

Publication Number Publication Date
EP0120320A2 true EP0120320A2 (de) 1984-10-03
EP0120320A3 EP0120320A3 (en) 1986-01-29
EP0120320B1 EP0120320B1 (de) 1988-05-11

Family

ID=11164397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101993A Expired EP0120320B1 (de) 1983-03-21 1984-02-25 Rahmenwerk für Seriendrucker

Country Status (5)

Country Link
EP (1) EP0120320B1 (de)
KR (1) KR880001141B1 (de)
DE (1) DE3471046D1 (de)
FI (1) FI77603C (de)
IT (1) IT1160812B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617432A1 (fr) * 1987-07-01 1989-01-06 Printronix Inc Ensemble a navette interchangeable pour imprimante
EP0523569A1 (de) * 1991-07-12 1993-01-20 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungssystem
US5215395A (en) * 1989-05-09 1993-06-01 Texas Instruments Incorporated Printer chassis
EP0814595A3 (de) * 1996-06-21 1998-11-11 Eastman Kodak Company Gerät zum Erhalten der Positionsrelation eines Druckkopfes
US5896143A (en) * 1992-09-03 1999-04-20 Canon Kabushiki Kaisha Ink jet recording apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2954951A (en) * 1959-01-26 1960-10-04 Viewlex Inc Slide lock mounting means
US4222673A (en) * 1978-09-20 1980-09-16 Durango Systems, Inc. Print head carriage assembly for serial printers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617432A1 (fr) * 1987-07-01 1989-01-06 Printronix Inc Ensemble a navette interchangeable pour imprimante
US5215395A (en) * 1989-05-09 1993-06-01 Texas Instruments Incorporated Printer chassis
EP0523569A1 (de) * 1991-07-12 1993-01-20 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungssystem
EP0570988A1 (de) * 1991-07-12 1993-11-24 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungssystem
US5480243A (en) * 1991-07-12 1996-01-02 Canon Kabushiki Kaisha Ink jet recording system
US5896143A (en) * 1992-09-03 1999-04-20 Canon Kabushiki Kaisha Ink jet recording apparatus
EP0814595A3 (de) * 1996-06-21 1998-11-11 Eastman Kodak Company Gerät zum Erhalten der Positionsrelation eines Druckkopfes

Also Published As

Publication number Publication date
KR840007990A (ko) 1984-12-12
EP0120320A3 (en) 1986-01-29
FI77603B (fi) 1988-12-30
EP0120320B1 (de) 1988-05-11
FI77603C (fi) 1989-04-10
FI841061L (fi) 1984-09-22
DE3471046D1 (en) 1988-06-16
FI841061A0 (fi) 1984-03-16
IT1160812B (it) 1987-03-11
KR880001141B1 (ko) 1988-07-01
IT8320172A0 (it) 1983-03-21

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